13240243042021 has 4 divisors (see below), whose sum is σ = 13255170036192. Its totient is φ = 13225316047852.

The previous prime is 13240243041947. The next prime is 13240243042027. The reversal of 13240243042021 is 12024034204231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13240243042021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13240243042027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7463495755 + ... + 7463497528.

It is an arithmetic number, because the mean of its divisors is an integer number (3313792509048).

Almost surely, 2^{13240243042021} is an apocalyptic number.

It is an amenable number.

13240243042021 is a deficient number, since it is larger than the sum of its proper divisors (14926994171).

13240243042021 is an equidigital number, since it uses as much as digits as its factorization.

13240243042021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14926994170.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 13240243042021 its reverse (12024034204231), we get a palindrome (25264277246252).

The spelling of 13240243042021 in words is "thirteen trillion, two hundred forty billion, two hundred forty-three million, forty-two thousand, twenty-one".